This patch fixes several bugs in the lowering of AMDGPU raw buffer
operations. These bugs include:
- Incorrectly handling the offset of the memref, causing errors when
using subviews.
- Using the MaximumOp (float specific op) to calculate the number of
records.
- The number of records in the static shape case.
- The lowering when index bitwidth=i64.
Furthermore this patch also switches to use MLIR's data layout to get
the type size.
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Co-authored-by: Jakub Kuderski <kubakuderski@gmail.com>
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